Auxillary Fan Operation

[alexk]

shimmy and all, do we have a photo of a non-AC CSL to see how the radiator looks like ?

What is interesting is that the heat-generating monster M5 F10 has no front radiator fan for the AC and only a rear electric radiator.
http://mfans2.com/parts/catalog/F10/...rts/#2283923_1

Here another information of the upgraded fan of the Z4 35is and 1M.
http://www.e90post.com/forums/showthread.php?t=797466

I think I will remove completely the fan clutch and the AC fan from my car.
I start to think that the AC fan and case is reducing the air flow.
Otherwise I cannot explain why BMW ditched it from the M5 F10 which is the most challenging car they ever built in terms of heat management.

I found a CSL without AC and in front of the radiator there is nothing blocking the air (like in my M5).
I will get back later with some pics of my DIY.

[alexk]

I found a CSL without AC and in front of the radiator there is nothing blocking the air (like in my M5).
I will get back later with some pics of my DIY.

So here what I did to bin the AC fan -> https://nam3forum.com/forums/forum/c...931#post498931

[terra]

shimmy and all, do we have a photo of a non-AC CSL to see how the radiator looks like ?

What is interesting is that the heat-generating monster M5 F10 has no front radiator fan for the AC and only a rear electric radiator.
http://mfans2.com/parts/catalog/F10/...rts/#2283923_1

Here another information of the upgraded fan of the Z4 35is and 1M.
http://www.e90post.com/forums/showthread.php?t=797466

I think I will remove completely the fan clutch and the AC fan from my car.
I start to think that the AC fan and case is reducing the air flow.
Otherwise I cannot explain why BMW ditched it from the M5 F10 which is the most challenging car they ever built in terms of heat management.

BMW ditched the front fan in almost all of their vehicles. They have since opted to simply use more powerful fans. That electric fan in that M5 is a 1000W unit -- the AC fan in the M3/CSL is paltry 200W in comparison. The Z4M (S54) also ditches the AC fan in favor of a 600W puller fan in front of the radiator. Also note that the E46 non-M also has an electric-only fan, though only 400W

Rather than delete both fans, I think it would be best to put an electric fan in the front. I think the non-M fan would be sufficient for any M3 that isn't driven in the desert.

[uncle benz]

Nerdy fact of the day... If your viscous fan coupling is weak or failed completely, the car will use the a/c fan to reduce temperature if needed.

[shimmy]

Nerdy fact of the day... If your viscous fan coupling is weak or failed completely, the car will use the a/c fan to reduce temperature if needed.

Looking at the controls data AlexK posted on the electric fan, we can all see that Gareth......you'll have to work harder here to get a nerd prize :bigcry:

[Neil M]

I'm no expert at things mechanical but looking a the pics posted, it might make more sense to remove the radiator shroud than the fan, in terms of increasing air flow.
The surface area of the fan appears minimal compared to that of the shroud. :whistle:

[alexk]

Neil the electric fan cannot sit in air...
The fan shroud is used to keep it into place.

[Neil M]

Ha, ha, I said I was no expert! :hahaha:

[Mike RT4]

Neil was going to use his patented sky hooks .

[mattCSLnut]

Neil was going to use his patented sky hooks .

... or nail it in place with a glass hammer :clown:

[alexk]

Is anyone having an electric fan instead of the clutch fan?

[stevenEK9]

Is anyone having an electric fan instead of the clutch fan?

finally finished the new setup on my M3

brand new genuine bmw water pump
brand new genuine bmw thermostat
50/50 coolant/water mix with genuine bmw coolant
both oem fans removed
16" slim fan wired in, powered by the oem auxiliary fan controller
triple core full aluminium fluidyne/tms radiator
samco hoses (mostly as mine were feeling a bit tired)


couple things to note

- no shroud fitted as the fan is only really there to pull air through on idle and low speed traffic, which it does a good enough job of without a shroud
- centre air scoop removed as the airbox takes a direct feed from a CSL rep bumper using the oem csl ducting


been running the car with the digital coolant readout in service mode just to keep an eye on the temps and so far so good. heading to the ring in just under 2 weeks for DN10 so will see how it goes then, cooling system took a whopping 9 litres to fill from empty with the new radiator :smt120


fan controller relocated to under airbox



engine bay as it is now

[alexk]

What brand/type is your fan ?

[stevenEK9]

What brand/type is your fan ?

here you go, lifetime warranty and rated to 1850cfm

http://www.mishimoto.co.uk/mishimoto-accessories-16-inch-fan.html

PERFECT size that you can drill a couple small holes in the top and bottom 'lip' of the radiator and it will bolt straight up :beer:

[alexk]

I just saw the specs and the power is only 120W.
That's very low.

My Z4 35is has a 600W fan and my M5 a 1000W.
The 120W sounds like a hairdryer :smt108